Family. Davaineidæ, Fuhrmann, 1907.
Rostellum cushion-shaped. Armed with numerous (sixty to several thousand) hammer-shaped hooks in two (rarely one) rows.
Sub-family. Davaineinæ, Braun, 1900.
Suckers armed. Uterus breaks up into egg capsules. Paruterine organs absent.
Family. Tæniidæ, Ludwig, 1886.
Suckers unarmed. Uterus with median longitudinal stem and lateral branches. Female genitalia at the hind end of the proglottis. Genital pore irregularly alternating. Testes numerous in front of female genitalia. Ovary with two lobes (wings). Vitellarium behind the ovary. Embryophore radially striated.
The Cestodes of Man.
Most of the species to be mentioned live in man in their adult stage and occupy the small intestine; man is the definite host of these parasites, but is not the specific host for all the species; some of these species, as well as others (of mammals), may occur in man also in the larval stage.
Family. Dibothriocephalidæ.
Sub-family. Dibothriocephalinæ.